A former rock star is hunting down a Nazi criminal. This could be his greatest hit.

When legendary goth rocker Cheyenne (two-time Academy Award winner Sean Penn), long-retired in Dublin with his firefighter wife, Jane (Academy Award winner Frances McDormond), learns his estranged father is dying, the childlike recluse travels to New York to seek reconciliation - only to arrive too late. Upon discovering his father's unfulfilled quest for revenge against an ex-Nazi war criminal taking refuge in America, Cheyenne embarks upon his own journey of reawakening in this engaging and unpredictable road adventure from internationally acclaimed director Paolo Sorrentino.